WattCalc LAB

EV Winter Range Calculator

Estimate realistic winter driving range using battery capacity, normal consumption, cold-weather penalty and usable state-of-charge window.

Currency selection changes the unit label, not an exchange rate. Enter every price in the selected currency.

My EV Optional

Only individually source-backed fields are filled. If usable capacity is not established, enter it manually for your exact vehicle. Gross pack labels are not usable energy. Saved inputs are your own editable assumptions.

kWh
kWh/100 km
%
%
%

How to choose the inputs

The cold-weather input is a consumption increase, not a direct range reduction and not a temperature forecast. Choose it from your own comparable trips or use several explicit scenarios. The tool does not infer this value from a vehicle preset.

Formula and measurement boundary

Winter consumption = baseline consumption × (1 + increase / 100). Available energy = capacity × (departure − reserve) / 100. Range = available energy / winter consumption × 100.

Three worked scenarios

These are fixed hypothetical examples, not live tariffs or verified product data. They use EUR and kilometres where applicable and do not change with the form settings. Only the table input changes.

Unchanged inputs

  • Usable battery capacity: 60 kWh
  • Mild-weather consumption: 20 kWh/100 km
  • Departure charge: 100 %
  • Arrival reserve: 10 %
Change one input; compare the result
Cold-weather consumption increaseEstimated result
0 %270 km
25 %216 km
50 %180 km

All examples retain 6 kWh and use 54 kWh for driving. A 25% consumption increase reduces range by 20%, not 25%, because range is divided by 1.25. The 0%, 25% and 50% inputs are illustrative, not claims about a particular model.

What this result does not establish

  • Route, speed, wind, elevation and heating are not separate inputs.
  • A fixed usable capacity does not simulate temperature-dependent battery availability or aging.
  • A retained reserve reduces the estimate but does not guarantee arrival.

A consumption increase is not the same percentage range reduction

The following are additional hypothetical decision examples. Separately discussed fees, reserve allowances or running costs are not automatically added to the form result.

If summer consumption is 20 kWh/100 km and the scenario adds 30%, winter consumption becomes 26. A 60 kWh usable pack gives 300 km at the first rate and 230.8 km at the second. Range decreases by 23.1%, not 30%, because range is inversely proportional to consumption. Applying a 30% range cut as well would count the same scenario twice.

For a practical charging leg from 80% down to 15%, only 39 kWh is available. That gives 195 km at 20 kWh/100 km and 150 km at 26. The full-pack headline range is not the same as the planned leg. Use the trip-energy calculator to include starting charge and reserve explicitly.

Measure repeat journeys with similar speed, tyres, load and route before attributing a difference to weather. Record temperature, wind, preconditioning and whether journeys were short or long. The winter penalty here is an input assumption; the tool does not model temperature, battery heating, reduced usable capacity or the effect of elevation. Use a conservative measured rate for the trip rather than a universal winter percentage.

Sources and their scope

These reference pages were accessed on 21 September 2026. The equations and examples are the site’s own model; these sources do not certify its defaults or results.

Frequently asked questions

Should I use grid consumption?

Use battery-side driving consumption for range; charging losses happen before that energy is stored.

Can I account for battery aging?

You can enter a lower measured usable capacity, but the calculator does not estimate degradation itself.

Read the model and verification limits

Updated 14 October 2026. Examples are hypothetical; owner observations are identified separately.

IONIQ 5 owner observations: build a trip energy reserve

Compare two reported consumption observations with your own route, usable capacity and charge reserve. Export a calculation record.

Compare energy budgets →